Chemical method of removing paint film on plastic resin using isopropyl alcohol

Abstract

Thermosetting paint film is removed by adding plastic resin coated with thermosetting paint film into a mixed solution of an alcoholic solvent and alkali and heating this mixed solution while stirring. Isopropyl alcohol, phenoxy alcohol and alkali are added in a reactor and heated to a temperature of 50-70° C. while stirring. Plastic resin coated with thermosetting paint film is added and a reaction is performed while maintaining the temperature. The isopropyl alcohol and phenoxy alcohol are added in a mixed ratio of 70-90:30-10.

What is claimed is:  
     
       1. A method of removing thermosetting paint film by adding plastic resin coated with thermosetting paint film into a mixed solution of an alcoholic solvent and alkali and heating this mixed solution while stirring, wherein said method comprises: 
       a) adding isopropyl alcohol, phenoxy alcohol and alkali in a reactor and heating this mixture to a temperature of 50-70° C. while stirring; and  
       b) adding plastic resin coated with thermosetting paint film and performing a reaction while maintaining said temperature, wherein said isopropyl alcohol and phenoxy alcohol are added in a mixed ratio of 70-90:30-10.